Top-Down Mechanism of Perception: A Scenario on the Role for Layer 1 and 2/3 Projections Viewed from Dynamical Systems Theory
Cortical layer 1 is the main entrance of top-down signals from other higher cortices and subcortical nuclei. Recent findings challenge the view that top-down signals play just a modulatory role. However, how top-down signals are implemented to help reconstruct the internal representations of images, or an episode of events is poorly understood. Recent experimental data suggest that the ongoing brain state without external inputs into layer 4 and attentional top-down signals continually fluctuates among the intrinsic patterns of activity. Viewed from a dynamical systems standpoint, the transitory intrinsic states could be an expression of attractor ruins, observed in a mesoscopic dynamical system. We hypothesize that when top-down signals arrive as attention(s), contexts, or indices, the local brain state is temporarily stabilized to be an attractor(-like) state. In view of the anatomical and physiological configurations of neuronal systems in the superficial layers, we propose a hypothetical scenario for such non-classical dynamics in the brain.
Cortical layer 1 Superficial layers Top-down mechanism of perception Internal representations of images Attentional top-down signal Attractor ruin Milnor attractor Presynaptic inhibition of GABA release Muscarinic acetylcholine Glutamate
Hiroshi Fujii Kazuyuki Aihara Ichiro Tsuda
Department of Intelligent Systems, Kyoto Sangyo University, Kyoto 603-8555, Japan Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan
国际会议
The Second International Conference on Cognitive Neurodynamics--2009(第二届国际认知神经动力学会议)
杭州
英文
79-84
2009-11-15（万方平台首次上网日期，不代表论文的发表时间）